/Engine/Source/Runtime/Engine/Public/Materials/MaterialAttributeDefinitionMap.h
FMaterialCustomOutputAttributeDefintion ( const [FGuid](API\Runtime\Core\Misc\FGuid) & InGUID, const [FString](API\Runtime\Core\Containers\FString) & InAttributeName, const [FString](API\Runtime\Core\Containers\FString) & InFunctionName, EMaterialProperty InProperty, EMaterialValueType InValueType, const FVector4 & InDefaultValue, EShaderFrequency InShaderFrequency, MaterialAttributeBlendFunction InBlendFunction )